{
  "annotation_id": "1152d13d-1a5b-4941-9a7b-a46fcaec0aaa",
  "date_created": "2026-03-02T18:02:17.208000Z",
  "date_modified": "2026-03-02T18:02:17.208000Z",
  "file_hash": "5f608422fc5646d518efe1581efa200f33c4f5a025fcdd4e957301a709e59677",
  "private": false,
  "record": {
    "abstract": "We construct a device that can unambiguously discriminate between two unknown\nquantum states. The unknown states are provided as inputs, or programs, for the\nprogram registers and a third system, which is guaranteed to be prepared in one\nof the states stored in the program registers, is fed into the data register of\nthe device. The device will then, with some probability of success, tell us\nwhether the unknown state in the data register matches the state stored in the\nfirst or the second program register. We show that the optimal device, i. e.\nthe one that maximizes the probability of success, is universal. It does not\ndepend on the actual unknown states that we wish to discriminate.",
    "arxiv_id": "quant-ph/0504201",
    "authors": [
      "Janos Bergou",
      "Mark Hillery"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.94.160501",
    "journal_ref": "Physical Review Letters 94, 160501 (2005)",
    "title": "A universal programmable quantum state discriminator that is optimal for   unambiguously distinguishing between unknown states",
    "url": "https://arxiv.org/abs/quant-ph/0504201"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "51bb6cfe-bb2d-4d2c-a558-03fff7e1aae0",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}